Stone reverse reads:''Rest well in the cool (place)
for only a short while.
The curtain is about to arise
on the approaching eternity*,
then you shall appear,
with skin and bone**, before
the chair of the Lamb."

Note:
* The German literally translates closer to "it will soon play the act, the approaching eternity" but this is awkward and difficult to understand.
** I believe "skin and bone" alludes to the body of the deceased being resurrected, like Christ, with incorruptible flesh."